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The helium-rich hot subdwarf LS IV -14 116 shows remarkably high surfaceabundances of zirconium, yttrium, strontium, and germanium, indicative ofstrong chemical stratification in the photosphere. It also shows photometricbehaviour indicative of non-radial g-mode pulsations, despite having surfaceproperties inconsistent with any known pulsational instability zone. We haveconducted a search for radial velocity variability. This has demonstrated thatat least one photometric period is observable in several absorption lines as aradial velocity variation with a semi-amplitude in excess of 5 km s$^{-1}$. Acorrelation between line strength and pulsation amplitude provides evidencethat the photosphere pulsates differentially. The ratio of light to velocityamplitude is too small to permit the largest amplitude oscillation to beradial.

Radial velocity measurements of the pulsating zirconium star: LS IV -14 116